package com.example.xiaoxueqixiangmu.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Md5Utils {
    public final static String MD5(String s){
        char hexDigits[]={'0','1','2','3','4','5','6','7','8','9',
                'a','b','c','d','e','f'};

        try {
            byte[] btInput=s.getBytes();
            //获得MD5摘要算法的MessageDigest对象
            MessageDigest mdInst=MessageDigest.getInstance("MD5");
            //使用指定的字节更新摘要
            mdInst.update(btInput);
            //获得密文
            byte[] md=mdInst.digest();
            //把密文转换成十六进制的字符串形式
            int j=md.length;
            char str[]=new char[j*2];
            int k=0;
            for (int i=0;i<j;i++){
                byte byte0=md[i];
                str[k++]=hexDigits[byte0>>>4&0xf];
                str[k++]=hexDigits[byte0&0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}
